#fwc-whatsapp-button {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background-color: #25d366;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
    cursor: pointer;
    z-index: 9999;
    background-image: url('https://upload.wikimedia.org/wikipedia/commons/6/6b/WhatsApp.svg');
    background-size: 60%;
    background-position: center;
    background-repeat: no-repeat;
}